Ivan Seeking
Staff Emeritus
Science Advisor
Gold Member
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We couldn't possibly grow enough corn in the US to make enough ethanol to replace gasoline in the US. It is even argued by some that ethanol from corn is an energy sink.
Even if we assume a nominal net efficiency 30%, a typical gross of 400 gallons of fuel per acre-year of corn, and a demand of 400 million gallons per day, it would take [as a best case] about 1 billion acres of corn, which would be just under half the land area of the US. This also ignores that ethanol has about 60% as much energy per gallon as does gasoline, so in principle we need almost the entire land area of the US to make enough ethanol to replace gasoline, given the current demand.
Even if we assume a nominal net efficiency 30%, a typical gross of 400 gallons of fuel per acre-year of corn, and a demand of 400 million gallons per day, it would take [as a best case] about 1 billion acres of corn, which would be just under half the land area of the US. This also ignores that ethanol has about 60% as much energy per gallon as does gasoline, so in principle we need almost the entire land area of the US to make enough ethanol to replace gasoline, given the current demand.
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